I think you have some good arguments but you're missing a great deal of things.
In your first point you talk about stones not being able to try diamond gear in kitpvp, but that is Why we added the points and shops so you can still get diamond armor even though you aren't a donator.
In your other point you talk about, the fact that if you spend 17 dollars on a server you are allowed to do what you want with what you bought. Now first, get the thought of it being a purchase out of your head. Its called a donation for a reason. You give a donation because you want to help something out. We have just made it more appealing to donate by giving rewards but that doesnt give you the right to do whatever you want with it. Its a rule, there for you shouldnt break that rule. It would be the same thing as buying minecraft, hack on a server, get banned and then go on to say, i am allowed to hack or else my 15 € wouldnt be Well spent.
You might think that its unfair but when you are playing on our server you have agree with the rules. Saying that you didnt get your moneys worth, money that you donated to an indie project, and is there for allowed to break the rules is a bs argument i my opinion